Yi Liu created HDFS-7045:
----------------------------
Summary: Fix deadlock of open file (in some cases)
Key: HDFS-7045
URL: https://issues.apache.org/jira/browse/HDFS-7045
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Yi Liu
Assignee: Yi Liu
Priority: Critical
There will be deadlock for current logic as following ({{resolvePath}} could
throw exception, then deadlock):
In {{FSNamesystem#getBlockLocationsUpdateTimes}}:
{code}
...
if (isReadOp) { // first attempt is with readlock
checkOperation(OperationCategory.READ);
readLock();
} else { // second attempt is with write lock
checkOperation(OperationCategory.WRITE);
writeLock(); // writelock is needed to set accesstime
}
src = resolvePath(src, pathComponents);
try {
...
} finally {
if (isReadOp) {
readUnlock();
} else {
writeUnlock();
}
}
{code}
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